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Dependence of Residual Rotation Measure (RRM) on Intervening MgII Absorbers at Cosmic Distances

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arxiv 1307.2678 v1 pith:QPDWP2JH submitted 2013-07-10 astro-ph.CO

Dependence of Residual Rotation Measure (RRM) on Intervening MgII Absorbers at Cosmic Distances

classification astro-ph.CO
keywords interveningaroundmeasuremgiirotationsamplewavelengthabsorber
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the dependence of residual rotation measure (RRM) on intervening absorption systems at cosmic distances by using a large sample of 539 SDSS quasars in conjunction with the available rotation measure catalog at around 21cm wavelength. We found an excess extragalactic contribution in standard deviation of observed RRM of about 8.11+/-4.83 Rad/m^2 in our sample with intervening MgII absorber as compare to the sample without MgII absorber. Our results suggest that intervening absorbers could contribute to the enhancement of RRM at around 21cm wavelength, as was found earlier for RM measurements at around 6cm wavelength.

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